Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I hear you. I’ve been watching videos and studying pics.
Some authentic installations as well as many demo set ups. The problem with demo set ups  as I see them, is very often the engine owner just wants to spin something for the entertainment of the public, and may apply an engine far larger than needed to a load, and other times it’s not obvious whether or not that’s the case. Hence much of my confusion.
Conversely, a video of a working box factory showed relatively small engines used to operate some fair sized machines. 

I did see Jin’s boat propeller experiment video and noticed what was then apparently  the prototype M91. It seems to have handled the load nicely, and I agree would be a lovely engine in an RC work boat from the era. If I wasn’t legally blind and banned from the road, and still had a boat to chase after it, I’d have a go at a river scow myself. Har.